uuid

RFC4122 UUID generation for JavaScript — create v1, v3, v4, v5, and v7 UUIDs for entity identification and distributed systems.

uuid

General JS

RFC4122 UUID generation for JavaScript — create v1, v3, v4, v5, and v7 UUIDs for entity identification and distributed systems.

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3.8 kB

10.0 kB raw

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The Problem

Generating universally unique identifiers for database records, distributed events, and API resources requires RFC4122 compliance. Rolling your own UUID implementation risks subtle entropy or formatting bugs.

What It Does

The uuid package generates all major UUID versions: v4 (random, most common), v7 (time-ordered for database index performance), v1 (time-based), v3/v5 (namespace-based, deterministic). All output is formatted as the canonical xxxxxxxx-xxxx-xxxx-xxxx-xxxxxxxxxxxx string.

Installation

bash
npm install uuid

Usage Example

typescript
import { v4 as uuidv4, v7 as uuidv7, validate, version } from 'uuid';

// Random UUID (most common)
const id = uuidv4(); // '9b1deb4d-3b7d-4bad-9bdd-2b0d7b3dcb6d'

// Time-ordered UUID (better for database indexes)
const orderedId = uuidv7(); // '018e3c1a-7f2a-7a8b-8b2c-4b5d6e7f8a9b'

// Validate
validate('not-a-uuid'); // false
validate(id);            // true

version(id);             // 4

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